You win when you surround your opponent on every side of their colored space or spaces with your colored spaces. It is possible to tie in this game.
Playing the game:
Play begins with the first player selecting any triangle on the board. The next player must then select a space that shares a side (not tip) with the triangle that was selected. After the first triangle is selected each player alternates by selecting a single space (triangle, square or rectangle) that is connected to the side of any space already selected, whether it be your own, or your opponent’s space. Game ends when a player surrounds an opponent’s space, or spaces, on all sides.